根据下列各句句意和空白之后的汉语提示词，在写出对应单词的正确、完整形式，每空只写一词。
Window screens are ___________(有效的) in keeping out mosquitoes.
An old man in _____________(寒酸的) clothes came to the door.
The other possibility, Mr. Jouanny said, was that the _________(小偷) might just like the painting.
Will it be ______________(方便的) for you to start work tomorrow?
All of them are______________(教授) of chemistry at Chicago University.
This is the most important___________(改革)of the police service in over 50 years.
Just now the police came and __________(逮捕) the man who had robbed the bank.
The bell____________(表示) the end of the period rang, interrupting our heated discussion.
We are going to ________________(删除) some names from the list.
The object of this society is to perfect its members ___________(实际地) and scientifically.